9977885209 has 4 divisors (see below), whose sum is σ = 9983502004. Its totient is φ = 9972268416.

The previous prime is 9977885189. The next prime is 9977885227. The reversal of 9977885209 is 9025887799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3545845209 + 6432040000 = 59547^2 + 80200^2 .

It is a cyclic number.

It is not a de Polignac number, because 9977885209 - 2⁷ = 9977885081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9977885509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2805732 + ... + 2809285.

It is an arithmetic number, because the mean of its divisors is an integer number (2495875501).

Almost surely, 2^9977885209 is an apocalyptic number.

It is an amenable number.

9977885209 is a deficient number, since it is larger than the sum of its proper divisors (5616795).

9977885209 is a wasteful number, since it uses less digits than its factorization.

9977885209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5616794.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The square root of 9977885209 is about 99889.3648443116. The cubic root of 9977885209 is about 2152.8453554323.

The spelling of 9977885209 in words is "nine billion, nine hundred seventy-seven million, eight hundred eighty-five thousand, two hundred nine".